Solex Carb Issue

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HQ327
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Solex Carb Issue

Post by HQ327 » Sun Mar 04, 2018 8:42 pm

MB is turning over, fuel pump pumping, fuel getting to carb, yet not starting. Replacement Solex, trying to start using choke and throttle. Any suggestions to get it started? Replacement after parts on old carb broke. Might I have a bad carb as after reading past threads that may be an issue?

Ideas, suggestions?

THANKS!

Jeff

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Re: Solex Carb Issue

Post by artificer » Sun Mar 04, 2018 9:10 pm

No throttle or pumping the pedal. Make sure the fuel is getting to the float bowl. Needle & seat control this aspect could be closed & not letting fuel in.
Choke is actually excess fuel for starting & doesn't work like a choke. Start & when the engine starts running rough after a minute or 2 push in.
http://oacdp.org/pdfs/solex.pdf
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.

Wolfman
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Re: Solex Carb Issue

Post by Wolfman » Mon Mar 05, 2018 7:33 am

What John said with a little more detail.
Solex does not have a choke plate, like Carter WO. It has an Enrichment Circuit.
When starting cold, pull the choke which opens the enrichment valve and do not give any throttle. Opening the throttle during cranking defeats the enrichment circuit. The throttle must stay completely closed, until the engine starts and warms up a bit. Then close the "choke" and you are ready to go.
Mike Wolford
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Mark Jesic
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Re: Solex Carb Issue

Post by Mark Jesic » Mon Mar 05, 2018 7:43 am

Thanks for that information Mike, i sometimes used to press on throttle and when cold, it usually fires the 3rd or 4th time, would this make a first time fire if i didnt touch the throttle ?

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Re: Solex Carb Issue

Post by Wolfman » Mon Mar 05, 2018 8:04 am

With the WO carb, a little throttle would help starting but with the Solex, any throttle at all defeats the enrichment process and makes cold starting more difficult, if not impossible.
The enrichment circuit on a Solex, is a seperate passage that goes around the carb. throat and comes in under the throttle plate. When the "choke" is applied, a valve is opened in the enrichment circuit and the fuel is pulled through the side passage, into the engine. If the throtlle is opened during starting, no fuel is pulled through the enrichment circuit and the cold engine is too lean to start.
Mike Wolford
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Comm./Inst. SEL
AOPA ( 44 yrs)
EAA ( 44 yrs)
4th Inf. Div. - 5th Inf. Div. - 2nd Armor Div. - CIB


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Re: Solex Carb Issue

Post by Mark Jesic » Mon Mar 05, 2018 11:06 am

Thanks for your help Mike.

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Re: Solex Carb Issue

Post by Mark Jesic » Thu Mar 08, 2018 2:48 am

Well, my jeep has stood for 4 weeks, (due to a holiday), after reading these threads, i gave it more choke, and pulled the throttle out slightly. Expecting four or five turnovers, yes its been freezing over here, it fired up first time, so thanks to John and Mike. You never stop learning with a jeep. :D :D

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Re: Solex Carb Issue

Post by brad » Tue Mar 13, 2018 1:16 pm

Ive had a solex on my jeep for 11 yrs and as they say when cold max choke even though its not a choke very little if any throttle. As soon as it starts start pushing in the choke as needed to achieve idle with the choke pushed all the way in. Dont pump the pedal when trying to start also

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Re: Solex Carb Issue

Post by artificer » Tue Mar 13, 2018 2:10 pm

In the UK [in particular] the Land Rover using a similar Solex carburettor is started using an identical fashion/method to how the Jeep L134 needs to be started. So guys just investigate how the LR owners book suggests one starts their engine.
John GIBBINS Member Institute of Automotive Mechanical Engineers [Ret], ASE Master Medium/Heavy Truck & Auto Technician USA -2002 Licensed Motor Mech NSW MVIC 49593 Current 2015
TO DIAGNOSE, TROUBLESHOOT OR FAULT FIND ANY AUTO SYSTEM....
Understand how system parts interact with one another. GOOD parts can then be established & the NOT GOOD problem/s part/s isolated for repair or replacement.

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